Ask HN: Editing Date Formats for Different Regions?

For the webdevs/product guys/girls, when having editable dates do change the format of the editor for each region?

Example: Americans - MM | DD | YYYY vs Aussies - DD | MM | YYYY

If you do, did you allow for this change at the get go of your MVP or did you wait for a little traction and see what region that traction is within?

Or did you resolve this by using a fancy editor where its <Name of Day> of <Name of month> selector? (Drop down boxes)